Hey, just a question -

Find the angle, correct to two decimal places, that the lines joining the given points make with the positive direction of the x-axis: \(\left(c,b\right)\ and\ \left(b,c\right)\)

I know how to do it when there are numbers and when it is positive but this just does not make sense?

Can someone help? I'm up to =

\(\tan\theta=\frac{c-b}{b-c}\)

I'm not sure what to do next if anyone can help me? Thanks!

Modified this because I was just going to skip the question until I came to something more weird??

Find the gradient of a straight line which is:

a) inclined at an angle of 120 degrees to the positive direction of the x-axis (first quadrant)

I wrote one question because I wanted to try the rest of them